Choo is a blue hot star, 340 times more luminous than the Sun, but only 6 times broader.
It belongs to a special category of star of class B, the stars “Be” - the “E” meaning here “emission”. The stars of this category emit transmission lines in the spectrum of the Hydrogène because they are surrounded by a formed thick disc of Atome S of this element. This disc is caused by the very fast rotation of star, in 3,8 hours with the equator, the speed of 315 km/s. In fact, its absorption spectrum is superimposed on that of Choo and darkens certain parts of the latter.
Choo is a star doubles. His/her companion is only magnitude 11 and with the distance from 4.100 UA, it spends at least 94.000 years to achieve its Orbite.
Probably because of its position in the sky, α Arae does not bear any name given by a Mediterranean civilization . The Chinese Civilization on the other hand named it Choo , which means the Stick .
Although named α Arae, it is not - except at the time of eruptions - the most brilliant star of the constellation, being preceded by β Arae by 1% magnitude.
Common noun: Choo
- Designation of Bayer: α Arae
- Designation of Flamsteed: no
- Harvard Revised Photometry: HR 6510
- Henry Catalog To drape: HD 158427
- Catalog SAO: SAO 228069
- Fifth Fundamental Catalogs: FK5 651
- Washington Doubles Catalog Star: WDS 17318-4953
- Catalog Hipparcos: 85792
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